Electromagnet.



A. E. SINK.

ELECTROMAGNET- APPLIOATION FILED JAN. 25, 1909.

Patented July 27, 1909.

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INVENTOR W a 11:

. B! MM ATTORNEYS A. E. SINK.

ELEGTROMAGNET;

APPLICATION FILED JAN. 25, 1909.

929,256. 7 Patented July 27, 1909.

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i (2 3% 6'. vm /c ATTORNEYS WITNESSES I I UNITED fsTAT s PATENT o rFIcE.

' ALBERT EvsIN oF N-EWYORK, Ni'Y'. I

I EIECTROMAGNEII Specification of Letters Patent} Application filed January 25, 1909; Serial,.No. 41am.

To allwhom-it mayconcerm Be it known, that I ALBERT E. SINK, a.citi- -'z en-of.;theiUnited States, and resident of the borough of Brooklyn, county of-- Kings-, city. 5 and State of NewYork, haveinvented certain-newand useful; Improvements in .Elecs. tromagnets, of which-theifollowingis a speci-. fication. 7

My invention relates to .electromagnets 10 whether of the usual kind having cors,,or. of, the coreless type (solenoid). Byapeculiar winding ofthecoils, as described and claimed hereinafter, I avoid self-induction andthe-x s arking which resultstherefromwhenthe circuit isbroken.

Reference is to; behad to; the accompany-. in%drawings in which-- igurel 1s aplanwew: of a SPSIkOOlLGHI- bodyrng my invention, with part of: the sec? ondar'y winding omitted; Fig. 2 is an'end view of such cOiL-Figs. 3 and 4 are diagrams showin two ways -of arranging the. connec tionso theprimary windings; Fig. 5 shows, upon an enlarged scale, a'portion'of the in,- 2 tertwined. or-twisted wire strands used in my. invention ;.and Fig. .6:is-a cross section of thecomposite Wire.

' A indicates asuitable basewithmthecustomaryheads A A at the'ends of. the; coils.- -,B is the core projected adjacent to the; armature orvibrator C, engaged by the contact screw D; Any other approved cons I struction inay be adopted for-fthe interruter. ,is the secondarywindin of the induction coil, having terminals 1% E and surrounding the primary Winding.

So far the construction need not differ from theusual construction of s ark coils.

peculiar winding and its connections, which a 1n the resent embodiment are illustrated as applie to the primary winding'of the coil.

1 According to my invention, I employ a plurality of strands or windings intertwined orl twisted together. In the particular example shown, the primary coil consists of three separately insulatedstrands or windings F,

magnetic or induction effect is desired and G, H, twisted together longitudinally "as '50 shown in Fig. land more clearly in Figs. '5

and 6, the composite Wire .or cable'thus.pro- L duced being wound to form the primary" j vwinding J in the same manner as if it were a 7 single strand of insulated wire. The ends of i the'stranid F are connected with the binding My invention resides particu arly in the A strand G in a se arate circult with a battery,

the disturbing and detrimental eflect of the. self-induction arising when the current conposts or terminalsF, F those of the strand c with-terminals s, cc; diameter-she.- strand with theterminalsHfi, Ht One-ct the strands, for'instanceiH, istconnectedrim serieswith a resistance or iheostat to-fonm a closed circuit therewith, IniFigsfiand 4 the -rheostat is indicated. diagrammatically; at),

M. In Figs-'1 and 21 ihaveillustrated a; a121- ticularconstruction of-such;-.rheosta-t;". iclhcomprises .832, conductingh'andle; K; mounted;-

to swing about ;the center and connected with a; binding post K from which a ,wirel-L. leads to the terminal H This handle... 61in gages a} bare resistfincm-coiL-hi; arran ed :in;

the-arc of. figzQiIfClG ,whosacenteniisatad jacent windin s or-turns ofsthis =coilare not 1n contact-wit .ea'ch othen One-endpfthe. coilM is connected iw'th; thebinding-post -,Mi,'

from which a;li ne L eads to theiterlilinaliflii The other stran d s,. F- and-G rare-connected with; a-sounce of, electricity. In.- Fig'snl and 4, the two strands- F}. and: G .are connected in, parallel with the-same source of; electricity,- such :asa; battery" N. The position ,of the interrupter @is indicated diagrammatically-at.- Lin Fig, 4.; In;detail,.the-connectionsmmy beas -follows (Fig- .1) Arwire; O leadsnfrom one t ole. of. the battery to a the ,terminal -;F;-'- whic in this caseis connectediwith the-telminal G by a wirerl; The tern1inalsG and F? are connected by-.a;:wzire-Q,- andna-wire S connects. the terminah F? *WifililfilZhQJCOlliidGii' screwd), :(through' thB medium, ;of- -the usual: metallic parts)'.- The armature on :vibraton, C is connected with=the other'pole of the battery by a Wire 0.

The Wires P, Q are readily removable so that other connections may be made if desired. For instance, as indicated in Fig. 3 I may connect the strands F in series with a battery N and an interrupter I and the N this latter clrcuit being simply a charging circuit; I find that the addition of such a charging circuit apparently increases the strength of the current induced in the second ary coil E this current being sparkless, or practically so.

My invention is applicable wherever a the current for producing this efiect varies,

' whether such current simply fluctuatesor is entirely interrupted at t mes as in the examples shown. With my invention I avoid dition changes. The stra'ndXH) which-is or circuits (whether they are connected in parallel as in Figs. 1 and 4, or operated separately as in Fig. 3) acts in direct opposition to the electromotive force of self-induction produced in the active circuit or strands (such as F and G); This neutralization is obtained without detracting from the mag- 'netizing power of the active portion (F and G) of the composite coil, provided the resistance of the inductively char ed circuit (H,

(R) is equal to or exceeds wit in reasonable limits, that of the charged circuits (F and G).

It will be understood that the number of.

- strands intertwined or twisted together may be varied without departing from the nature of my invention as defined in the claims. The invention has been described in connection withthe primary coil of an induction apparatus, but may be used for electric motors and dynamos, telephones and in general any apparatus using 001 s and exposed todetrimental selfinduction.

I claim as my invention: 1 1 An electromagnet coil provided with a composite wire comprising a lurality of insulated strands intertwined 'ongitudinally,

said composite wire being wound to form a I coil, and a resistance in closed circuit with one of said strands.

2.- An electromagnet coil provided with a composite wire comprising a lurality of insulated strands intertwined on itudinally, said composite wire being woun toform a coil, and a variable resistance in closed circuit with one of the said strands.

3. ,An electromagnet coil provided with a composite wire comprising a plurality of insulated strands twisted together and forming a body which is a proximately circular in cross section, sai composite wire being wound to form a coil, and a resistance in closed circuit with one of said strands.

4. An'electromagnet coil provided with a composite wire comprising a plurality of insulated strands twisted together and forming a body which is approximately circular in cross section, said com osite wire being wound to form a coil, an a variableresist ance in closed circuit with one of said strands.

5 An electromagnet coil provided with a composite wire comprising a lurality of insulated strands intertwined ongitudinally, said composite wire being wound to form a coil, a resistance in closed circuit with one of said strands, and means for supplying a varying current to the remaining portion of the composite wire.

6. An electromagnet coil provided with a composite wire comprising a lurality of insulated strands intertwined on itudinally,

.said composite wire being woun to form a coil, a variable resistance in closed circuit with one of said strands, and means forsupplying a varying current to the remalnlng portion of the composite wire.

In testimony whereof I have hereunto set my hand in the presence of two subscriblng witnesses.

ALBERT E. SINK."

Witnesses JOHN 'Lo'rKA,' F. F. KIRKPATRICK. 

